Man Made (Synthetic Rock)

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Boxwork or Septarian Concretion

Septarian nodule / Boxwork weathering

Sea Glass

Silicon dioxide (mostly)

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)

Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Asphalt (Bituminous Pavement)

Bituminous mix (Aggregates with Bitumen binder)

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Slag

Metallurgical by-product

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Slag Glass (Cullet)

Amorphous Silica (man-made), primarily SiO2 with trace metal oxides

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Quartz pebble (Quartztite fragment)

Silicon Dioxide (SiO2)

Weathered iron-rich concretion or ironstone nodule

Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrated iron oxides)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Stainless Steel (Polished)

Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)

Asphalt Chunk (Bituminous Concrete)

Aggregated Bitumen / Artificial Breccia

Clear quartz sphere

Quartz (silicon dioxide, SiO₂)

Man-made Crystal (Lead Glass)

Lead oxide-doped Silica Glass (approx. SiO2 + PbO)

Goldstone (Red/Brown)

Aventurine Glass (SiO2 with Copper inclusions)

Loose faceted colorless gemstones, likely quartz or glass-like mineral chips

Most consistent with quartz (SiO₂), though the photograph cannot exclude synthetic cubic zirconia or glass

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Clear-stone silver-tone teardrop earring

The stones may be colorless quartz or glass; the image does not allow reliable identification. Metal setting appears silver-tone.

Conglomerate

Conglomerate Rock (Paraconglomerate)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Slag

Metallurgical Slag

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Red cabochon gemstone ring (likely ruby or red spinel; identity unconfirmed)

Possibly corundum (ruby, Al₂O₃) or spinel (MgAl₂O₄); visual identification alone cannot distinguish these from glass or synthetic stones.

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Blue-stone and diamond ring

Blue stone is possibly blue sapphire (corundum, Al₂O₃); surrounding stones appear to be diamonds (carbon, C).

Goldstone (aventurine glass)

Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone

Faceted colored gemstones, likely synthetic corundum or glass imitations

Not identifiable from the image; possible synthetic corundum (Al₂O₃)

Moldavite

Tektite (Impact Glass), ~80% SiO2 + Al2O3

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals

Possible obsidian or slag glass

Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag